Variable-stroke regulator for pumps.



G. I. BRAUNING. VARIABLE STROKE REGULATOR FoR PUMPS.

APPLICATION FILED DEC.6. 191i. 1,280,148. Patented 001. 1,1918.

IIIIII Till-1.4,L I I1, S I l l um 1 s II,

comtois J.- BRAUNING, or DETROIT, MICHIGAN.

VARIABLE-STROKE REGULATOR FOR PUMPS.

Specification of Letters Patent.`

Patented oet. 1, 191s.

Application filed necenibee, 1917. `smal Nb; 205,707.

regulator mechanism, and has special ref-1A erence to a mechanism that has been designed for pumps associated with internal combustion engines, hydraulic motors, bearings or other structures where it is desired to supply ai predetermined quant-ity Aof fuel, liquid, water, lor other liquider fluid, and at times vary the quanti-ty, which may be accomplished by varying' the stroke of thel pump` employed.

VThe primary object of my invention is to provide a variable stroke regulator of the above type wherein positive and reliable means are employed, in a manner as hereinafter set forth, for regulating the stroke of a member, and it is in this connection that said' stroke regulating meansk may be` employed 'for governing mechanisms, for instance ratchet mechanism, used for feeding purposes. Primarily,'the mechanism isintended to regulate the stroke of a Vpu-mp piston so that a desired quantity of liquid or fiuid` will be moved by thepump piston.

A further object of my invention is to provide a compact mechanism o'fV the above char- Y able stroke regulator;

Fig. r2 is a vertical sectional view of the same;

' Fig. 3 is an enlarged det-ail of a cam adapted to form part of the mechanism;

Fig. All is a verticalsectional view of a modified stroke regulator, and

Fig. 5 is aside elevation, partly in section, of a further modification of my inven; tion.

Reference will first be had to Figs. 1 to 3 inclusive showing the preferred form ofV construction, and in these views the reference numeral 1 denotes a portion of a con'- ventional form of pump cylinder having a stuffing box 2 for a` piston rod3. -Suitably supported from the pump cylinder 1 is a bracket d provided with an integral transverse bearing 5 for a rock shaft 6 and one end of said rock shaft has a crank 7 in order that it may be rocked or oscillatedby a rod 8 connected thereto.

Supported by the bearingv 5 and the bracket 4 is -a lower reduced end 9 of a cylindrical casing 10, said' casing having al suitable closure 11 at the upper end thereof. The casing 10 has a bearing 12 for a reci-procable guide rod 13 and connected to one end of said guide rod is an adjustable member 14 by which the rod may be reciprocated.

The casing 10 also has opposed bearings 15 and journaled in said bearings is a shaft 16 which extends transversely of the casing 10; Slidably keyed on the shaft 16 for rotative continuity therewith is a sleeve'l' and the outer end of said sleeve has an annular groove 18 into which extends a. fork 19 carried by the recip'rocable guide rod 13. Adjacent the grooved end of the sleeve 17 is a worm 2() engaging the spiral or angu`- larly disposed teeth 21 of a sector gear 22, mounted on the rock shaft 6, and it is through the medium of said rock shaft and its sector gear that an oscillatory movement may be imparted to the shaft 16 and it is through the mediumV of the reciprocable guide rod 13 that the worm 20 may be correctly positionedl relatively to the sector gear 22 so thatV the shaft 16 will be properly oscillated.

On the shaft 16, within the casing 10, is a disk 23 having cams 24' in opposed relation and said disk andi-ts cams are in the slot or bifurcation of a headi 25 within the casing 10 and attached to' the piston rod which extends into the reduced end 9 of said casing. The head 25 has side openings 26 providing clearance for the shaft 16 and in the bifurcation or slotted head are antifrictionalV wheels or rollers 27 that may be either engaged by the periphery of the disk 23 or the cams 24. carried thereby.

vEncircling thefupper end of the piston rod 3, within the reduced end 9 of the casing 10, is a coiled spring 28 and the expansive force of this spring is adapted to take up lost motion and maintain the rollers 27 in engagement with the disk 23 or the cams 24.

The casing 10 is adapted to contain a lubricant and the upper end of said casing has a port 28L so that lubricant may flow to the oscillatory shaft 6. The lubricant may also enter the reduced end 9 of the casing 10 and insure an easy movement for the lower end of the head 25 within the reduced end of the casing.

The cams on the cam disk 23 are of even rise and subtend an equal arc of not more than ninety degrees, and if only one cam and roller are used the arc subtended bythe cam may reach ninety degrees plus. The oscillation of the cam is limited to the same arc subtended by the cam or cams. As shown in Fig. 3 the cam disk has two opposed cams withthe ends thereof merging into surfaces representing opposed arcs having a common center, but di'erent radii and the disk is conveniently divided into four parts whereby the cams will have a dened rise and known direction. r1`he cams are equal to the arc of oscillation of disk and may be limited to ninety degrees.

To utilize this characteristic of the cams for the purpose of varying the stroke of the pump, as shown in Figs. 1 and 2, the spiral gears 20 and 21 are employed to so position thev cams, with respect to the rollers receiving their thrust and transferring it 'lo the rod 3, that any desired portionof the cam rise may pass the rollers 27. l am. able to eliminate all movement of the piston rod by positioning the cam disk through an arc I equal to that subtended by the cams and in that case the rollers will ride on the circular portion of the cam disk, which cannot iinpart any movement to the piston rod. lt will be apparent that by properly positioning the cam with respect to the rollers that the stroke of the piston can be varied from zero to full stroke by the means recited above. The rotating of the cam disk for the purpose of positioning the cams is effected y shifting the spiral gear 20 from the position shown in Fig. 1 outward. l/Vhen the gear 20 is flush with the outer edge of the gear 21, the cam disk with its shaft will have been rotated through an arc equal to that subtended by the cams or the oscillation, providing the teeth of the gear are at suitable angles, and the roller will ride on the circular portion of the cam disk and the piston rod will be maintained stationary. lVhile in the position shown in Fig. 1 the piston rod receives full stroke or lift of the cam, and any position of the gears 20 and 21, between these extremes corresponds to a fraction of a stroke.

1t is apparent that one of the cams will serve one of the wheels or rollers 27 and the other cam the otherA wheel or roller, and that when the guide rod 13 is reciprocated the worm 20 may be positioned in desired relation to the sector gear 21, such shifting of the worm causing the shaft 16 to be partially rotated so that the desired portion of the cam may be brought into action to insure a 'desired stroke of the piston rod 3. 1t is therefore possible, even during the operation of the pump, to vary the stroke of the piston rod 3 by sinrply adjusting the guide rod 13 and such adjustment may be so minute as to cause the pump to deliver exactly the desired quantity of liquid or fluid necessary for vari ons purposes. Y Y

As showing various ways of accomplishing this variable regulation 1n connection with a piston rod, reference will be had to Figs. 4 and ,5. 1n the former, there is shown a suitable casing 29 having a closure 30 and extending into said casing is a piston rod 31 provided with a guide head 32. Encircling the piston rod 31 between the head 32 and the bottom of the casing is a coiled compression spring 33, and the head 32 has the upper end thereof provided with aconcave wall 34.

Journaled transversely of the casing29 is a rock shaft 35 and mounted on said shaft is a cam member 36 and a crank 37, the former being within the casing 29, and the latter outside thereof, so that the rod 0r other device may be connected to the crank 37 for rocking the shaft 35. The cam member 36 is disposed above the concave wall 34 of the head 32 and engaging the concave wall 34 is a slice 38, carried by the end of the link 39, .which has an anti-frictional roller 40 normally engaging the cam member 36. The link 39 is pivotally connected to the crank 4l of the rock shaft 42, journaled transversely of the casing 29, and on the outer end of the rockV shaft 42 is a crank 43 connected to a rod or member 44 so that the shaft 42 may be rocked to adjust the shoe 38 between the head 32 and the cam member 36. y

1n operation, the rock shaft has a predetermined oscillatory movement, and the cam member 36 impinging against the anti-frictional roller 40 is adapted, through the medium of the shoe 38, to lower the piston rod 31, and thespring 33 will restore said piston rod to normal position. By adjusting the shoe 38, the peak of the cam member 36 may cause a maximum travel of the piston rod 31, and this is accomplished by shifting the shoe 38 toward one end of the concave Wall 34, while the position at the opposite end of the concave wall will provide for the minimum stroke of the piston rod 31. This is a clear instancerof where an adjustable member is. interposed between the end of a piston rod j and its actuating medium so that said member may be adjusted to regulate the stroke of the piston rod.

Reference will now be had to Fig. 5, showing a suitable casing 45 and this casing has a bracket 46 as a guide for a normally spring elevated piston rod 47. In the casing 45 Vare journaled two shafts 48 and 49, and the '50 and the crank 5l is pivotally connected by a link 52 to a crank 53 of the shaft 49. The-crank 53 is loose on the shaft 49 and said crank has a member 54 adapted to be engaged by a cam 55 fixed relatively to the shaft 49. On the outer end of the shaft 49 is a crank 56 which permits of said shaft being oscillated while the member 54 is supported to be actuated by the cam 55.

Extending transversely of the casing 45 is a rod or shaft 57 and on said rod or shaft isma rocker arm 58, the inner end of which is engaged by the member 54 and the outer end of which engages the upper end of the piston rod 47. The inner end of the rocker arm 58 is curved, and through the medium of the rock shaft 48 and its connections with the crank 53, the member 54 may be adjusted to regulate the actuation of the rocker arm 58 and consequently the stroke of the piston rod 47.

It is thought that the operation and utility of the mechanism will be apparent Without further description, and while in the drawings there are illustrated the preferred embodiments of my invention, it is to be understood that the structural elements are susceptible to such variations and modificationsV and a spiral gear and worm adapted to effectfl the relation of said means to said piston rod to regulate the stroke thereof by having the spiral gear shifted relative to the worm.

2. The combination with a piston rod, of a casing at the end thereof, means having a cam action operatable in said casing and adapted to effect the recipro'cation of said piston rod, and means including a rock shaft adapted to adjust said means to regulate the stroke of said piston rod.

3. In a variable stroke regulating mechanism, the combination with a piston rod, cam actuated means adapted to shift said rod, oscillatory means adapted for actuating said cam actuated means, andmeans including a rock shaft and worm adapted to effect the relation of the cam actuating means relatively to said piston rod to regulate the stroke thereof.

4. In a variable stroke regulator for pumps, the combination with a piston rod, of a casing through which said rod extends, a head carried by said rod within said casing, cams in the head of said rod adapted to cause a reciprocation thereof, means eX- teriorly of said casing adapted for oscillating said cam, and means including a rock shaft operatable in connection with the last mentioned means and adapted to adjust said cam to regulate the stroke of said piston rod.

5. The combination of a reciprocable member having an end thereof bifurcated, anti-frictional rollers in the bifurcation of the reciprocable member, an oscillatory cam between said anti-frictional rollers, said cam having portions thereof equal to arcs of oscillation with said portions of equal rise and directed the reverse of each so as to receive the thrust of said anti-frictional rollers and the reciprocable member connected thereto, and means including two members adapted for oscillating said cam, one of said members being adjustable relative to the other so as to regulate the stroke of said reciprocable member.

In testimony whereof I afiix my signature 1n the presence of two witnesses.

GOTTLOB J. BRAUN ING.

Witnesses:

KARL H. BUTLER, ANNA M. DoRR.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. G." 

